142 lines
5.3 KiB
C
142 lines
5.3 KiB
C
/* crypto/des/fcrypt_b.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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/*
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* This version of crypt has been developed from my MIT compatible DES
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* library. The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au
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* Eric Young (eay@cryptsoft.com)
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*/
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#define DES_FCRYPT
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#include "des_locl.h"
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#undef DES_FCRYPT
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#undef PERM_OP
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#define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
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(b)^=(t),\
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(a)^=((t)<<(n)))
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#undef HPERM_OP
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#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
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(a)=(a)^(t)^(t>>(16-(n))))\
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void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
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DES_LONG Eswap1)
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{
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register DES_LONG l, r, t, u;
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#ifdef DES_PTR
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register const unsigned char *des_SP = (const unsigned char *)DES_SPtrans;
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#endif
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register DES_LONG *s;
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register int j;
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register DES_LONG E0, E1;
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l = 0;
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r = 0;
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s = (DES_LONG *)ks;
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E0 = Eswap0;
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E1 = Eswap1;
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for (j = 0; j < 25; j++) {
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#ifndef DES_UNROLL
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register int i;
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for (i = 0; i < 32; i += 8) {
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D_ENCRYPT(l, r, i + 0); /* 1 */
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D_ENCRYPT(r, l, i + 2); /* 2 */
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D_ENCRYPT(l, r, i + 4); /* 1 */
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D_ENCRYPT(r, l, i + 6); /* 2 */
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}
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#else
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D_ENCRYPT(l, r, 0); /* 1 */
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D_ENCRYPT(r, l, 2); /* 2 */
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D_ENCRYPT(l, r, 4); /* 3 */
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D_ENCRYPT(r, l, 6); /* 4 */
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D_ENCRYPT(l, r, 8); /* 5 */
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D_ENCRYPT(r, l, 10); /* 6 */
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D_ENCRYPT(l, r, 12); /* 7 */
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D_ENCRYPT(r, l, 14); /* 8 */
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D_ENCRYPT(l, r, 16); /* 9 */
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D_ENCRYPT(r, l, 18); /* 10 */
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D_ENCRYPT(l, r, 20); /* 11 */
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D_ENCRYPT(r, l, 22); /* 12 */
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D_ENCRYPT(l, r, 24); /* 13 */
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D_ENCRYPT(r, l, 26); /* 14 */
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D_ENCRYPT(l, r, 28); /* 15 */
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D_ENCRYPT(r, l, 30); /* 16 */
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#endif
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t = l;
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l = r;
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r = t;
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}
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l = ROTATE(l, 3) & 0xffffffffL;
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r = ROTATE(r, 3) & 0xffffffffL;
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PERM_OP(l, r, t, 1, 0x55555555L);
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PERM_OP(r, l, t, 8, 0x00ff00ffL);
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PERM_OP(l, r, t, 2, 0x33333333L);
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PERM_OP(r, l, t, 16, 0x0000ffffL);
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PERM_OP(l, r, t, 4, 0x0f0f0f0fL);
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out[0] = r;
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out[1] = l;
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}
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